91357435656 has 40 divisors (see below), whose sum is σ = 255885411870. Its totient is φ = 30452478336.

The previous prime is 91357435567. The next prime is 91357435679. The reversal of 91357435656 is 65653475319.

91357435656 is a `hidden beast` number, since 9 + 1 + 3 + 5 + 74 + 3 + 565 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 91304291556 + 53144100 = 302166^2 + 7290^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 70491201 + ... + 70492496.

Almost surely, 2^91357435656 is an apocalyptic number.

It is an amenable number.

91357435656 is an abundant number, since it is smaller than the sum of its proper divisors (164527976214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91357435656 is a wasteful number, since it uses less digits than its factorization.

91357435656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140983715 (or 140983702 counting only the distinct ones).

The product of its digits is 10206000, while the sum is 54.

The spelling of 91357435656 in words is "ninety-one billion, three hundred fifty-seven million, four hundred thirty-five thousand, six hundred fifty-six".